Carbureter.



C. H. GILLESPIE.

CARBURETER.

APPLICATION FILED MAR. 2. I911.

Patenfed Sept. 17,1918.

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CHARLES H. GILLESPIE, 0F BEMEN'I, ILLINOIS, ASSIGNOR, BY ME SNE ASSIGNMENTS, TO MAXRITE QARBURETOR COMPANY, A CORPORATION.

CARBURETER.

To all whom it may concern. 7

Beit known that 1, CHARLES H. GILLEs- PIE, a resident of Bement,'.county of Piatt, and State of Illinois,. have invented certain new and useful Improvements in Carbureters, of .which the following is a specificat1on.

carbureters and the principal object thereof is the provision of a device of this character which is simple in construction and eflicient in' operation, automatically controlling the relative proportion of the fueland air in the mixture during changes in the speedof the motor. I

A further object is theprovision of a device of this character in which the fuel, hydrocarbon or the like, is properly vaporized so as to insure efiicient combustion.

To the accomplishment ofthe foregoing and such other objects as may hereinafter appear, my invention consists in the construction, combination and arrangement of parts hereinafter described and then sought to be defined in the appended claims, reference being had to the accompanying drawing forming a part hereof and which shows for the purpose of illustrative disclosure a preferred embodiment of my invention, it being understood that various changes may be made in practice within the scope of the caimg without digressing from my inventive 1 ea.

In the drawings, p V

F'gure 1 represents a plan view of a deviceconstructed according to and embodying my invention;

Fig. 2 's a horizontal longitudinal section ofFig.l; 4

- Fig.3 is a vertical section on line 33 of i Fig. 4 is a vertical cross section on line H ofFig. 1. r Thi invention comprises, broadly ispeaking, a mixing chamber adaptedato receive the fuel from a suitable source of supply and having an air inlet, the quantityof fuel and air" admitted to, the mixing chamber being controlled by a member, the position of which is determinedipr' a j t d b h Specification of Letters Patent. 7

My invention relates to improvements in atented Sept. 1a, 1918. a li ation fi eiim r'ch 2, 1917. Serial no, 151,949.

speed of the motor, whereby. the relative proportion of the fuel and air admit-ted is maintained practically constant. Thorough mixture of the fuel-and air and vaporization of the mixture is also obtained.

Referring now-to the drawings, the numeral 1 designates the casingasa whole, having the chamber or compartment 2, adapted to receive a float, which is not shown as that feature of the construction is well known in the art. This float isused to operate a needle ,or other valve. so as to insure the maintenance of a suitable quantity of fuel in the chamber or compartment 2. This chamber or compartment 2, which I term the fuel upply chamber or compartment, has the passage 3 which may be controlled by a needle valve leading to the mixing chamber or compartment 4. This mixing chamber or compartment 4 has the enlarged operating portion or mixing chamber proper 5, to which the outlet 6 to the motor connects, and the reduced end portion 7 both of the portions of the mixing chamber being preferably cylindrical. The reduced'portion 7 of the mixing chamber is provided with'a plurality or series of apertures or ports 8 in the side thereof to connect the horizontal portion 3 of passage 3 from-the fuel supply chamber thereto for the admission of fuel, the end portl8 being the largest. I also provide the elongated longitudinally extending slot 9 opening into the top of the reduced portion 7 of the mixing chamber for the inlet of the air thereinto, as will presently be described.

Movably mounted in the mixing chamber i the controlling member 10, which is in the form of a double piston element, normally held in the position shown. It comprises the rod or shaft 11 having the large piston 12 secured on the end in the'mixing chamber proper and having the smaller piston 13 secured on the end positioned in the 'dra'wing, so that more of the fuel inlet ports running, so that the position ofthecontrolling member is varied according to the speed of the motor or theworlritisfdoing. Smaller, piston 13 is provided with the laterally extending cut-o'fF-plate' or extension air is'admitted and serves as a cutgoff to 'controlthe amount of the air admitted into the mixing'chamber. In the reduced por- "tion 7, I form a the stop flange or abutment 'at 2l forflimiting the inward movement of -'the'smallerjpiston. This stop orfabutment andithecut-offmember 20 are so arranged relatively that when the smaller piston reachesthe limit of its inward"m'ovement 'duel to the action of'the'spring, the cut-off memberwi'll cover; that portion ofthe air admission slot leading into the :mixing 30 chamber, andthe endport or aperture 8 will 3 open "into the mixing chamber. "This resultsinchokin'g the carbureter, so that a rich charge or mixture is left in the cylindersfor'startingand also a rich fuel mixture will be drawn in during the starting of the motor, the cut-off member 20 preventing the admission of air. But as soon asthe'engine starts," the controlling member moves outwardly under the influence of the air pressure against the larger piston due to the "reduction of the pressure against the inner side thereof on account of the suction of the engine. small air vent22 is provided for proper operation of the device. The adjusting screw 23 may be utilized in the larger cap 16.

The operation of the deviceis follows,

it being recalled that a quantity of the fuel is present in the chamber 2. The suction from the motor decreases the pressure against the inside of pist0n'12 and allows the atmospheric pressure, against the other side to overcome the pressure of the spring element I8,cau'sing; the controlling member to move to the left; looking; atFig. 2 of the 8 are. uncovered or opened and so thata larger or lo'nger'portion "of slot '9 is opened into the 'm'ixlng chamber, thereby admitting -more"fuel" as well as more air, so that the -i-e 1ative quantities offu'eland air admitted "ren'iain practically constant due j to the movement of the; controlling member under the influence the motor and atmospheric pressure. The-fuel" and air are "admitted in the same portion in the mixing chamber, so that they are readily mixed together before passing out through the outlet to the inlet manifol'c'lor other supply? tdethe motor.

1 It is-therefore seen that I have provided a device which is exceedingly simple in construction. and efficient-win; operation; mainstaining the same relative proportion of the air and fuel admitted to the carbureter and causing the same to be vaporized before passing to the-intake manifold,v resulting inigreater efiiciency. Necessary; sad-just ments may be made-by varying the spring, "thesizefofthe"ports 8 and slot 9, and also by the screw 23 in the cap 16. Whatl claim is: 0

including-"in combination a *fioat' chamber,

a mixing chamber or compartment "having 'twdcylindrical' .POltlOIlS, one "of said I, jp'o'r- Hons-having an' elongated slot along "its" top for the admission of i thereinto, agpassage extending from: said .fioatchamber and "along" the top. edge of said "cylindrical por- "ti'oniformed by the saidslot and having plurality er n1a1 ea's leading ?"from said passage" into the upper part of said cylindricaljporti'on, 'a controllingmember" in said mixing chamber or comp artment comprising apair of pistons mounted for movement'together, one 5 of said pistQ iS fittin'glin each cylindrical portion, the said pistonin the cylindrical portion-havi g a "slot being provided' Withf-an extension 5 adapted toifit over said 'slot, resilient 'means fornormally 'h'olding said controlling member in a position jto admit a minimumfquantityof fuelfinto the mixing chamber, said extensions serving to control thefadmission 'of air 'and 'the piston; to Whichfit 18"(5011118Gtd, servingas a 'cutofi to control the admission of fuelinto' the mixing chamber or compartment.

2, A devicejof the character de'scribed includlng n combination sa 'floatchamb'er, a

mixing "jchamber or compartment 5 having two cylindrical PO ItlOIIS, one of' saidfportions' having an elongated 's'lot along its top for the admission of air thereinto, pa's'sa'ge extending -from saidffioatj "chamber-and along the "top edge of said,- cyl'indiiical portion formed by the said slot andxha'ving a plurality of inlet ports leading from said passage into the upper part of said-cylindrh ocal portion, a controlling member 'ln said mixing chamber or compartment comprising a parrot p1st ns mounted for, movement "together, one of said'pistons fitting-,inieach cylindrical portion, the saidgpiston innthe ,y ii iq kpfi hiring- 2 slot eing pro- "vided; with an: ext nsion 'adapte'a'to fit over :sa'idg slot, resilient ineansfor normally holdin'g s ideontmlling" member in a position to a Inin'imu guantity' oif fu el into the mixing chamber, said extension; servingIto control the admission at ain'an'd the piston to which it is connected serving as a cut ofi her is closed by said extension and certain to control the admission of fuel into the of said fuel supply ports are open into the mixing chamber or compartment, and means mixing chamber so that an unrarefied sup- 1a to limit the inward movement of said pistons ply of fuel may be drawn into the mixing 5 so that When they are at the end of said inchamber in starting.

Ward movement the portion of said air admission slot opening into the mixing cham- CHARLES H. GILLESPIE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. G. 

